/**
 * Seed DynamoDB PaymentsDashboard table from Stampli CSV exports.
 *
 * Usage:
 *   node scripts/seed-from-csv.js <csv-file> [csv-file2] ...
 *
 * Reads one or more Stampli CSV exports and upserts every row into the
 * PaymentsDashboard table. Skips CashPro API calls entirely — this is
 * purely for populating the DB so the Slack App Home has data to display.
 */

import { readFileSync } from "fs";
import { parse } from "csv-parse/sync";
import { DynamoDBClient } from "@aws-sdk/client-dynamodb";
import {
  DynamoDBDocumentClient,
  UpdateCommand,
  PutCommand,
} from "@aws-sdk/lib-dynamodb";

const TABLE_NAME = "PaymentsDashboard";
const ddb = DynamoDBDocumentClient.from(new DynamoDBClient());

function toISODate(mdyDate) {
  const parts = String(mdyDate || "").split("/");
  if (parts.length !== 3) return null;
  const [mm, dd, yyyy] = parts;
  return `${yyyy}-${mm.padStart(2, "0")}-${dd.padStart(2, "0")}`;
}

const parseAmount = (value) => {
  const num = parseFloat(String(value || "0").replace(/,/g, "").trim());
  return isNaN(num) ? 0 : num;
};

async function seedFile(filePath) {
  const csvText = readFileSync(filePath, "utf-8");
  const rows = parse(csvText, {
    columns: true,
    skip_empty_lines: true,
    trim: true,
  });

  const normalizedRows = rows.map((row) => {
    const clean = {};
    for (const [k, v] of Object.entries(row)) {
      clean[String(k).trim()] = typeof v === "string" ? v.trim() : v;
    }
    return clean;
  });

  let count = 0;
  let skipped = 0;

  for (const row of normalizedRows) {
    const checkNumber = (row["Check Number"] || "").trim();
    if (!checkNumber) {
      skipped++;
      continue;
    }

    const method = (row["Method"] || "").trim();
    let status = (row["Status"] || "").trim();
    const sendOn = (row["Send Payment On"] || "").trim();

    // ACH payments clear automatically on their send date —
    // mark as Cleared unless voided/canceled
    const cancelStatuses = ["canceled", "cancelled", "marked as void"];
    if (method === "ACH" && !cancelStatuses.includes(status.toLowerCase())) {
      const sendDate = toISODate(sendOn);
      const today = new Date().toISOString().slice(0, 10);
      if (sendDate && sendDate <= today) {
        status = "Cleared";
      }
    }

    // Amount in USD is blank for canceled payments — fall back to Amount
    const amount = parseAmount(row["Amount in USD"] || row["Amount"]);
    const pk = `payment#${checkNumber}`;

    await ddb.send(
      new UpdateCommand({
        TableName: TABLE_NAME,
        Key: { pk },
        UpdateExpression: `
          SET #method = :method,
              payee = :payee,
              check_number = :check_number,
              invoice_numbers = :invoice_numbers,
              send_payment_on = :send_payment_on,
              amount_usd = :amount_usd,
              #status = :status,
              company_subsidiary = :company_subsidiary
        `,
        ExpressionAttributeNames: {
          "#method": "method",
          "#status": "status",
        },
        ExpressionAttributeValues: {
          ":method": method,
          ":payee": (row["Payee"] || "").trim(),
          ":check_number": checkNumber,
          ":invoice_numbers": (row["Invoice Numbers"] || "").trim(),
          ":send_payment_on": (row["Send Payment On"] || "").trim(),
          ":amount_usd": amount,
          ":status": status,
          ":company_subsidiary": (row["Company/Subsidiary"] || "").trim(),
        },
      })
    );
    count++;
  }

  console.log(`  ${filePath}: ${count} upserted, ${skipped} skipped (no check number)`);
  return count;
}

async function main() {
  const files = process.argv.slice(2);
  if (!files.length) {
    console.error("Usage: node scripts/seed-from-csv.js <csv-file> [csv-file2] ...");
    process.exit(1);
  }

  let total = 0;
  for (const f of files) {
    console.log(`Processing ${f}...`);
    total += await seedFile(f);
  }

  // Update metadata
  await ddb.send(
    new PutCommand({
      TableName: TABLE_NAME,
      Item: {
        pk: "metadata",
        file_name: "seed-from-csv",
        last_updated: new Date().toISOString(),
        last_file_count: total,
      },
    })
  );

  console.log(`\nDone — ${total} total payments seeded.`);
}

main().catch((err) => {
  console.error(err);
  process.exit(1);
});